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Hypermetropia and Its Correction

What is the r...

Question

What is the reason for the defect called hypermetropia?

A

The focal length of eye lens is large

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B

The focal length of eye lens is too short

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C

The eye ball has become too small

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D

Both a and c

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Solution

The correct option is D
Both a and c

In hypermetropia the focal length of eye lens is more or the eye ball becomes smaller than normal. Observing below the diagram will help to understand.

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Similar questions

Q. Too short eye ball and too flat lens produce

Q. Match the items given in A, B, C and D against their corresponding description given in 1, 2, 3, 4 and 5.
A. Astronomical telescope
B. Galilean Telescope
C. Simple Microscope
D. Compound Microscope
1. Contains one convex lens
2. Contains one concave lens
3. Contains a convex lens of large focal length in the objective and a convex lens of small focal length in the eye-piece
4. Contains a convex lens of small focal length in the objective and a convex lens of large focal length in the eye-piece
5. Contains a convex lens of large focal length in the objective and a concave lens of small focal length in the eye-piece.

Q. Match column I with column II and select the correct answer using the codes given below:

	Column I		Column II
(A)	Myopia	(p)	The power of accommodation of the eye decreases with ageing
(B)	Hypermetropia	(q)	The focal length of the eye lens is too long
(C)	Presbyopia	(r)	The focal length of the eye lens is too small
(D)	Astigmatism	(s)	The eyes fail to distinguish horizontal and vertical lines at the same distance

Q. Assertion :The focal length of objective lens in telescope is much more than that of eye piece. Reason: Telescope has high resolving power due to large focal length.

Q. A small telescope has an objective lens of focal length 144 cm and an eye piece of focal length 6.0 cm. What is the separation between the objective and the eye piece then?

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